Influence of the nitrided layer thickness of dies made of two types of tool steel used in hot extrusion of valve forgings made of nickel–chromium steel on the durability of these tools

• Autorzy: Hawryluk Marek , Lachowicz Marzena , Janik Marta , Ziemba Jacek , Gronostajski Zbigniew

Identyfikatory

DOI

10.1007/s43452-021-00301-8

• Języki publikacji: EN

Abstrakty

EN

The study constitutes an analysis of the durability of dies used in the first operation of producing valve forgings from chromium–nickel steel (NCF 3015) for motor trucks. The average durability of the dies (subjected to standard thermal treatment and nitriding) in this operation equals about 800 forgings. To perform an in-depth analysis of the effect of the nitrided layer thickness (0.1 mm and 0.2 mm) and the tool material (W360 and QRO90) on the possibilities of increasing the die durability, complex studies were carried out, which included: a macroscopic analysis combined with 3D scanning, microstructural examinations using a scanning microscope and a metallographic microscope, as well as hardness measurements. A minimum of three tools were tested for different variants, and for each of them, one representative die was selected for detailed examinations. The research showed the presence of abrasive wear, thermo-mechanical fatigue and traces of adhesive wear as well as plastic deformation on the surface of the working impressions. Also observed was the effect of the extruded material sticking to the tools (high friction and the presence of intermetallic phases in the extruded material) and the forging being blocked in the smallest section of the die, which is a critical factor causing a production shutdown and the necessity of tool replacement. The highest mean durability equalling 2600 forgings was obtained for the dies with a lower carbon content and a higher content of vanadium and the nitrided layer thickness at the level of 0.2 mm. The lowest mean durability (after one forging item) was recorded for the dies made of steel with a higher carbon content and a higher chromium content, forming less stable compound carbides and the thickness layer at the level of 0.1 mm.

Słowa kluczowe

EN

engine valve forging; nitrided layer thickness; forging tool durability; chromium-nickel steel; wear; destructive mechanisms

PL

zawór silnika; narzędzie kuźnicze; stal chromowo-niklowa; zużycie

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2021
• Tom: Vol. 21, no. 4
• Strony: 277--293
• Opis fizyczny: Bibliogr. 40 poz., rys., wykr.

Twórcy

autor

Hawryluk Marek

• Department of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, 5 Łukasiewicza Str, 50-371 Wrocław, Poland

autor

Lachowicz Marzena

• Department of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, 5 Łukasiewicza Str, 50-371 Wrocław, Poland

autor

Janik Marta

• Valves Extrusion, Mahle Polska, Krotoszyn, Poland

autor

Ziemba Jacek

• Department of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, 5 Łukasiewicza Str, 50-371 Wrocław, Poland

autor

Gronostajski Zbigniew

• Department of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, 5 Łukasiewicza Str, 50-371 Wrocław, Poland

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)